/**
 * Copyright (C)  Gadglet .
 *
 * This file is part of Gadglet
 *
 * Gadglet is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Gadglet is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Gadglet. If not, see <http://www.gnu.org/licenses/>.
 */

package com.gadglet.client.gwt.ui;


import com.gadglet.client.gwt.GadgetUtils;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.Image;


/**
 * loading ... image based on GWT DialogBox
 * Normally presented when the client perform a request to the server 
 * and still waiting for the response.
 *
 */
public class RequestLoadingImage {

		
	 private Image loadingImage = new Image();
	 private DialogBox dialogBox = new DialogBox();
	 private static RequestLoadingImage contentLoadingImage;

	  public static RequestLoadingImage getContentLoadingImage() {
	    if (contentLoadingImage == null) {
	    	contentLoadingImage = new RequestLoadingImage();
	    	
	    }
	    
	    return contentLoadingImage;
	  }
	private  RequestLoadingImage(){
		
		loadingImage.setUrl(GadgetUtils.getIconURL("loading", null, false));
		dialogBox.setWidget(loadingImage);
		// not visible
		dialogBox.setStyleName("");
		loadingImage.setPixelSize(100, 100);
	} 
	
	/**
	 *  display the loading image
	 */
	public void start(){
		dialogBox.center();
		
	}
	/**
	 *  Hide the loading image
	 */
	public void stop(){
		dialogBox.hide();
	}
	
}
